Mat-surface photographic paper



UNITED STATES ATENT ETQFFFICE.

MOTT W. MCDONALD, OF POLK, OHIO.

MAT-8U RFACE PHOTOG RAPHIC PAPER.

SPECIFICATION forming part of Letters Patent No. 593,775, dated November16, 1897.

Application filed February 1, 1897.

To all whom it may concern.-

Be it known that 1, Mom W. MCDONALD, a citizen of the United States,residing in Polk, in the county of Crawford and State of Ohio, haveinvented certain new and useful Improvements in Mat-Surface PhotographicPapers; and I do hereby declare the follow: ing to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to the art of making photographic or otherpictures.

The object is to produce a paper having a perfect mat surface, adaptedmore particularly for use in connection with the art of embossingphotographs, and also in the art of coloring the same, the resultattained in the first-named instance being that any cracking of thepaper when moistened for the purpose of being brought up in relief willbe avoided, and in the second instance the coloring may be readily andevenly applied to the paper with delicate and artistic effect, retainingall the tone of the color or colors.

The invention consists in producing an absolutely glazeless ordead-finish mat surface upon sensitized or other glossy paper.

To carry my invention into effect, I take a sheet of sensitized or otherpaper, the surface of which may have either a sized, burnished,pronounced glaze, or a so-called mat surface-that is, a surface withonly a slight glaze or glossand grind ofi the skin or mere surfaceglazing without removing the body thereof, or grind off the gloss.

The paper may be sized, enameled, or albumenized or be any so-calledmat-surface paper or any other paper having more or less glaze or gloss,and the grinding operation is to be performed after the paper has beensensitized and before it is printed,toned,

and finished, the object being to destroy only its immediate glazed orglossy surface and present a paper having a surface exhibiting a velvetyappearance.

The grinding may be effected in many ways, as by employing finely-pulverized pumice-stone, powdered emery, or any other abrasivesubstance capable of cutting without scratching. An efficient mode ofeffect- Serial No. 621,556. (Specimens) in g the. grinding is to lay thesheet of paper with its back upon a perfectly smooth surface, such asthat of plate-glass, sprinkle pulverized pumice-stone or other fineabradant upon the paper, and, the paper being kept or securedin anyproper manner against wrinkling, gently but evenly rub it on with thefingers until the glaze or gloss disappears,

being careful not to continue the operation longer than necessary merelyto get a perfect mat surface-that is, one absolutely free from glaze orgloss.

After" the paper has been groundit may then be printed out, toned, andfinished, or press-printed, emb0ssed,'or colored, or subjected to anyone or more of the treatments and operations exerted in producingmanufactured art productions, and in all these where the ground paperhas been employed the lights and shades will be modified, obviating anysharp, abrupt, or harsh effects and giving a softened appearance.

Besides giving the paper a beautiful, soft, and velvet-like mat surface,the grinding renders the paper more readily expansible and absorbent ofmoisture for the purpose of embossing or relief work, and themultitudinous retaining-points produced by the cutting action of theabrasive substance particularly adapt the paper for taking colors.

The great advantage of my invention is, with the superior appearance ofthe product, its great cheapness, utilizing the ordinary photographicpaper in general use.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of the United States, is

1. As a new article of manufacture, a sur face-ground, sized paper,presenting a mat surface, substantially as described.

2. The method of producing paper for photographic pictures, whichconsists in applying a sensitized surface to sized paper, and

then removing the gloss by abrasion, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.MOTT W. MCDONALD.

Witnesses:

R. G. DYRENFORTH,

R. M. ELLIOTT.

